Question

I want to visible a edit button on my previous activity by going back using back button. But when I am using

        @Override
            public void onClick(View arg0) {
                // finish the current activity
                finish();

            }

on my current activity, it is going back to previous activity, but edit button doesn’t become visible.

If I am using onResume on previous activity

@Override
    protected void onResume() {
        super.onResume();
        btnEdit.setVisibility(View.VISIBLE);

    }

then it’s always visible, no matter if the activity is resuming or created for the first time.

I am new in Android development, please help me to solve this problem.

Answer 1

Ok,

When you start the Activity, instead of startActivity(intent) use startActivityForResult(intent, 1989) (The 1989 can be whatever int you want).

When you return from the new Activity, before calling finish() do the following:

        Intent returnIntent = new Intent();
        returnIntent.putExtra("resultBool", true);

        //Null checks, not strictly neccescary 

            if (getParent() == null)
            {
                setResult(Activity.RESULT_OK, returnIntent);
            }
            else
            {
                getParent().setResult(Activity.RESULT_OK, returnIntent);
            }

    finish();

Then in your first Activity override onActivityResult() like so:

 @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
        {
            // The int you initially used
            if (requestCode == 1989)
            {
                if (resultCode == RESULT_OK)
                {
                    boolean result = data.getBooleanExtra("resultBool", false)

                    if (result)
                      //Show the button now

                }
            }
    }